Construction of Dynamical Information Space by using the Structual Properties of World Wide Web

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This research aims to develop efficient Web-crawlers and to investigate the basic properties of information delivery on the World Wide Web (WWW), based on the link structure evolved in the self organized manners, for dynamically constructing information space according to user's subjective viewpoints. The following results are reported with the published papers in the supported term of this grant.・From an analogy of interior point methods for the convex progtamming, we have studied the theoretical efficiency of the proposed geometric oprelations on the information space which consists of the degree of relations between information fragments combined by subjective viewpoints.・We have developed both types of master-slave and distributed Web-crawlers on the Java+HORB software environment for PCs in order to gather and analysis real data of the link structure. We have found a new phenomena of traversing between core pages of Web communities, and also discussed the load balancing problem on a heterogeneous system with different computational performances.・Simulation results have shown the important properties of the scale-free structure, which is commonly observed in many real complex networks including the WWW, for the defense strategies for cascading failures in packet routings and the damage size of spreading viruses on the networks with degree-degree correlations as similar to social/technological and bioligical systems.Furthermore, these activities have contributed with invited talks and the organization of symposiums in resarch comminities, as an enlightenment to introduce a new resaerch fileds.